The following error message is displayed when trying to connect with Trados Studio to a Trados GroupShare server:
 

<SDLErrorDetails time="13/12/2023 14:53:16">
  <ErrorMessage>One or more errors occurred.</ErrorMessage>
  <Exception>
    <Type>System.AggregateException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c5feseree089</Type>
    <HelpLink />
    <Source>mscorlib</Source>
    <HResult>-2146233088</HResult>
    <StackTrace><![CDATA[   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at Sdl.Desktop.Platform.ServerConnectionPlugin.Client.IdentityModel.UserManager2012Client.Ping()
   at Sdl.Desktop.Platform.ServerConnectionPlugin.Implementation.ServersDialog.ServerConnectionWorker.Connect()]]></StackTrace>
    <InnerException>
      <Type>SDL.ApiClientSDK.GS.Exceptions.NoPermissionException, SDL.ApiClientSDK.GS, Version=1.0.0.128, Culture=neutral,
 PublicKeyToken=c28cdb26c445c888</Type>
      <TraceId />
      <RequestMessage />
      <ResponseMessage />
      <HelpLink />
      <Source>SDL.ApiClientSDK.GS</Source>
      <HResult>-2146233088</HResult>
      <StackTrace><![CDATA[   at SDL.ApiClientSDK.GS.Rest.GroupshareRestClient.<HandleUnsuccessfulResponseByStatusCode>d__26.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at SDL.ApiClientSDK.GS.Rest.GroupshareRestClient.<SendRequestAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SDL.ApiClientSDK.GS.UserManagementV2Client.<PingAsync>d__10.MoveNext()]]></StackTrace>
    </InnerException>
  </Exception>
  <Environment>
    <ProductName>Trados Studio</ProductName>
    <ProductVersion>Studio17</ProductVersion>
    <EntryAssemblyFileVersion>17.1.8.17828</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 11 Home</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>3082</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>USERNAMEHERE</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>COMPUTERNAMEHERE</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>16464408 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

When looking into the Trados Studio log files (File - View Log File), the following errors are shown:
 

INFO [2023-12-13 13:48:30,011] Sdl.Desktop.Platform.Implementation.ResourceLoggingInternalCommandExecuter - 
Start#Id=4bd8874e-fb47-480c-89d6-642312dadwad55efc#Name=Connecting
...#ProcessName=SDLTradosStudio#PhysicalMemorySize=326144000#VirtualMemorySize=2226723#
ThreadCount=36#HandleCount=1434382#GdiHandleCount=999#UserHandleCount=495#TotalProcessorTime=00:00:06.7656250
INFO [2023-12-13 14:52:31,419] SDL.ApiClientSDK.GS.UserManagementV2Client - 
Calling GET https://servernamehere.com/api/management/v2/users?name=username@email.comexample
ERROR [2023-12-13 14:52:31,796] SDL.ApiClientSDK.GS.UserManagementV2Client - An error occured while getting the token : 
ERROR [2023-12-13 14:52:31,802] SDL.ApiClientSDK.GS.UserManagementV2Client - Server returned unsuccessful status code : 
Unauthorized, Message : StatusCode: 401, ReasonPhrase: 'Unauthorized', Version: 1.1, Content: <null>, Headers:
{
} Exception TraceId : 
FATAL [2023-12-13 14:52:31,828] Sdl.Desktop.Platform.UnhandledException - One or more errors occurred.
System.AggregateException: One or more errors occurred. ---> SDL.ApiClientSDK.GS.Exceptions.NoPermissionException: 
Server responded with Unauthorized while trying to make a "GET" REQUEST at Url: 
"https://servernamehere.com/api/management/v2/users?name=username@email.comexample". 
 User might not have permission to perform the attempted request
 Full response content: Response status code does not indicate success: 401 (Unauthorized).Content: StatusCode: 401,
 ReasonPhrase: 'Unauthorized', Version: 1.1, Content: <null>, Headers:
{
}
   at SDL.ApiClientSDK.GS.Rest.GroupshareRestClient.<HandleUnsuccessfulResponseByStatusCode>d__26.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at SDL.ApiClientSDK.GS.Rest.GroupshareRestClient.<SendRequestAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at SDL.ApiClientSDK.GS.UserManagementV2Client.<PingAsync>d__10.MoveNext()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at Sdl.Desktop.Platform.ServerConnectionPlugin.Client.IdentityModel.UserManager2012Client.Ping()
   at Sdl.Desktop.Platform.ServerConnectionPlugin.Implementation.ServersDialog.ServerConnectionWorker.Connect()

 

Rename the following config files:

1. Navigate to C:\Users\%username%\AppData\Roaming\Trados\Trados Studio\Studio17  (%username% will match your Windows user, you can directly copy/paste this path in File Explorer)
2. Rename BaseSettings.xml, Plugincache.xml, UserSettings.xml to _OLD (Ex.: BaseSettings.xml.OLD)
3. Navigate to C:\Users\%username%\AppData\Roaming\Trados\Platform\Identity and change the SDLTradosStudio.exe folder to SDLTradosStudio.exe_OLD
4. Reopen Trados Studio and retry the Trados GroupShare server connection via the File > Setup > Servers section

Corrupted Trados Studio config files.